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I have the same problem in setting up two displays, a Dell as primary and a VA2223wm Viewsonic as secondary, both connected to an Nvidia geforce 9500 GT. I think it might be the cable, but it's baffling. I have one DVI cable that seems to work on either monitor, and either plug on the graphics card. The second DVI cable doesn't seem to work, but when it's connected to the Viewsonic, the Nvidia control panel detects the monitor as secondary, so I can change settings, etc., but the monitor still says no signal. Each monitor works separately when connected with one cable, but not with the other.
Not Good.. After you've checked that the video cable is connected properly, make sure that all the pins in the video cable plugs are straight and not broken off. Then test on another PC. Make sure your CMOS battery has not gone flat, as some PC's will fail to load basic drivers if CMOS memory is lost. The battery should show no less than 2.5v, if it's marked 3 volts when tested on a multimeter. If you can't test it, just buy a new one at the supermarket or hardware, usually around $4.00. Next thing to try is your Video Card . If it is an on board one like most are now, there isn't anything you can do but try another card in an expansion slot or fit a new motherboard. At this point, I'm sad to say, you're better taking it to a PC shop where they will have a few things at their disposal to try.
Monitors rarely have drivers, aside from color profiles. It is the computer itself which is responsible for feeding standard data to the monitor and as a result any monitor which accepts the correct input (VGA, DVI etc) should work fine.
Due to the monitor only being 19 inches, you will not have any complications regarding different specification DVI, so I need not go into it.